Looks like there was once a redirect for http://www.pictureaustralia.org/ but it's now broken. It's still used as a schema URI (or at least, in this thing I've got here it is) and so my checker script is complaining.
This is a Mastodon instance primarily for Australasian Galleries, Libraries, Archives, Museums and Records people, and anyone else who wants to hang out with them. We use the Hometown fork which enables local-only posts.